Rotary engine



UNITED STATES PATENT EEicE.

GEORGE P. BUMP, OF LYNNEVILLE, IOWA.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 581,265, dated April 27', 1897.

Application filed July 10, 1896. $eria1No. 598,768. (No model.)

To all whom it may concern:

Be it known that I, GEORGE P. BUMP, a citizen of the United States of America, residing at Lynneville, in the county of Jasper and State of Iowa, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification.

The object of this invention is primarily to provide an engine in which the parts are all of cheap, simple, and durable construction and easily assembled, and,further, to provide an engine in which wear is reduced toaminimum and automatically compensated for.

My invention consists in certain details in the construction of the cylinder, hub, and piston and their relative arrangement and combination, as hereinafter set forth, pointed out in my claim, and illustrated in the accompanying drawings, in which Figure 1 shows a vertical section taken through the line 1 1 of Fig. 2, and Fig. 2 shows a vertical section at right angles to the first through the line 2 2 of Fig. 1.

Referring to the accompanying drawings, the reference-letter A is used to indicate the engine-frame, provided with a central chamber A designed to admit a cylindrical hub B. This hub is mounted to engage the top of the chamber and the said chamber is varied so much from a true'cylinder that a line of a given length passed centrally through the hub will engage the cylinder at both ends at all times during the rotation of the hub. The hub is made of somewhat greater length than the interior of the chamber, and an annular shoulder O is formed in each end-of the frame A, concentric with the opening in which the hub rotates, and a packing-ring O is seated on the shoulder. A head 0 having an .annular projection C designed to overlap the piece of metal, having an annular groove around its edges in which the packing D is' placed. At its sides the flat bars D are also inserted in said groove to rest on the packing and engage the sides of the opening on the hub through which the piston is passed, and

at the ends of the piston the bars D are inserted in the grooves and provided with aconcaved outer surface to admit a soft-metal roller D which is so arranged that less than half of its surface projects beyond the endof 1 This, it is obvious, will reduce hardened iron nearly all of the wear will be upon the roller, which may be easily replaced, and not upon the cylinder.

F indicates a stop extended longitudinally of the chamber at its top to engage the top of the hub. A strip of packing F is placed in the groove above the stop to force it down- Wardly.

The motion of the engine is controlled by means of a four-way valve located at the top of the cylinder and comprising a steam-induction pipe H, a passage H leading to a chamber H having four openings at its top, bottom, and sides, and passages H leading from its sides to the interior of the chamber, and an eduction-opening leading from its top. These passages H are widened at their lower ends. Their inner edges reach the strip T, and their outer edges are so far separated that one end of the piston will pass the edge of the exhaust-opening as soon as the other end passes beyond the inflow-opening, thus preventing back pressure and cushioning.

'Thevalve J is placed in this chamber H and I claim as new therein, and desire to secureby Letters Patent of the United States, is

A rotary steam-engine comprising the frame A having a chamber A shaped as set forth, ports of ingress and egress H at the top thereof, a stop F between said ports, a cylindrical hub B passed through the top of the chamber with its ends projecting beyond the chamber, a head detachably secured to each end of the frame and having an opening to admit the hub, a shoulder G adjacent to said and a two-Way valve to control the admission opening, a packing-ring C therein, a head of steam to the induction and exhaust ports, 0 for each end of the cylinder, having a prosubstantially as and for the purposes stated. 10

jection O to engage said packing-ring, screws GEORGE P. BUMP. 5 for clamping said heads 0 to the aforesaid Vitnesses:

heads and thus providing for the adjustment E. MACY,

of the packing-rings, a piston in said hub, O. O. MACY. 

